@Chris
I'm sorry to hear that you're experiencing issues with dropped calls. The 'silence-time-out' errors and the Twilio error code 31900 indicating an unknown stream failure suggest there might be a problem with the audio stream during the calls. This could be related to network issues, configuration errors, or problems with the Twilio service itself.
To address this issue, I recommend checking the following:
1. **Network Stability**: Ensure that the network connection is stable and robust enough to handle voice streams.
2. **Configuration**: Verify that the call setup and Twilio configurations are correct and haven't been changed recently.
3. **Twilio Service Status**: Check Twilio's status page to see if there are any ongoing issues with their service that could be affecting your calls.
4. **Permissions and Access**: Confirm that all necessary permissions, such as microphone access, are granted and functioning correctly.
5. **Contact Twilio Support**: Since the error is occurring on Twilio's side and is not specified, reaching out to Twilio support with the call ID and error code may provide more insight.
If you've already checked these aspects and the problem persists, please provide more details or any specific questions you have, and I'll do my best to assist you further. If you need to escalate this issue, please ask support for more info on this.